Yasōen (Name)野草園(名称)Two of the three characters match, so I'm confident this is the original of the name. It is read "Mogusaen," not "Hyakusoen." (Written in hiragana, it looks like "Iyaiyaen" lol.) It is busy only during the plum blossom season. Keio Line express trains, which normally don't stop here, do stop. You have to climb a very steep slope, so it's a fairly tough spot. The former school used for filming "Majisuka Gakuen" is nearby. The water tower that appeared in the final episode of "Heartcatch PreCure!" is also nearby.
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